over day, night, seasons, and weather conditions, a square meter of the earth’s surface receives an average of 240 W of radiant energy from the sun. The average power radiated back to space is A. Less than 240 W. B. More than 240 W. C. Approximately 240 W?.
Solution 2P Introduction: The earth tends to maintain a steady climate of its atmosphere. In order to do that, it must radiate back the same average power to the space as that it receives from the sun. Solution: Since the earth receives 240 W of energy on average from the sun per square meter, hence it is expected to radiate back the same amount of power to the space. Conclusion: Therefore, the average power radiated back to the space is approximately 240 W. So, option C is correct.